[Jason shuts the door but leaves it unlocked. It's an easy escape if either of them want to storm out. He then takes a deep breath and exhales before diving right into why he wanted to talk to Cass]

I'm sorry for making you feel like I wanted to use you like a weapon. That wasn't what I was trying to do. But even though it was an accident, your feelings got hurt and that wasn't right. I talked with Steph and she gave me a better understanding of why I upset you.

For a moment I thought talking with you was like fighting with Bruce again. That's my fault for getting angry at you like that.

[There. Straight to the point and hopefully with no ambiguity anywhere. For all his family issues, he'd rather get along with his alternative universe siblings than not. He still doesn't agree with Cass in regards to killing, but he'd rather not hurt her feelings again if he can help it. They were getting along so well before. It was... nice. And Jason would like to have more of that]